WO2004064383A1 - Scan-assisted mobile telephone - Google Patents

Scan-assisted mobile telephone Download PDF

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Publication number
WO2004064383A1
WO2004064383A1 PCT/EP2003/012096 EP0312096W WO2004064383A1 WO 2004064383 A1 WO2004064383 A1 WO 2004064383A1 EP 0312096 W EP0312096 W EP 0312096W WO 2004064383 A1 WO2004064383 A1 WO 2004064383A1
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WO
WIPO (PCT)
Prior art keywords
camera
images
image
document
relative
Prior art date
Application number
PCT/EP2003/012096
Other languages
German (de)
French (fr)
Inventor
Markus Simon
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to JP2004565937A priority Critical patent/JP2006514797A/en
Priority to US10/542,480 priority patent/US7773120B2/en
Priority to EP03815051A priority patent/EP1584181A1/en
Publication of WO2004064383A1 publication Critical patent/WO2004064383A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00127—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture
    • H04N1/00281—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture with a telecommunication apparatus, e.g. a switched network of teleprinters for the distribution of text-based information, a selective call terminal
    • H04N1/00307—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture with a telecommunication apparatus, e.g. a switched network of teleprinters for the distribution of text-based information, a selective call terminal with a mobile telephone apparatus
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
    • G06V30/10—Character recognition
    • G06V30/14—Image acquisition
    • G06V30/142—Image acquisition using hand-held instruments; Constructional details of the instruments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
    • H04N1/195—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a two-dimensional array or a combination of two-dimensional arrays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
    • H04N1/195—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a two-dimensional array or a combination of two-dimensional arrays
    • H04N1/19594—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a two-dimensional array or a combination of two-dimensional arrays using a television camera or a still video camera

Definitions

  • the invention relates to a method for scanning, in particular documents, and a mobile phone according to the preamble of claim 2.
  • the use of a camera with, for example, low resolution for scanning documents is known.
  • the camera or mobile phone is moved over the document from a short distance.
  • a result image is generated from the images or partial images recorded in the process.
  • the images are recorded, for example, with a high sampling frequency of typically 15 or 30 Hertz. For this reason, neighboring images have a very high image overlap.
  • a high-resolution result image can be continuously built up by lining up narrow image strips from the respective image center and taking into account the camera shift.
  • the invention has for its object in a method for scanning and to facilitate the scanning of documents in a mobile phone.
  • the method or mobile phone according to the invention enables the relative position of the camera sensor to the document to be determined quickly and robustly.
  • a reference pattern is faded into the field of view of the camera.
  • the evaluation of the geometry of the pattern in the images enables the differences in imaging in the images to be compensated for.
  • a small reference pattern is permanently projected to the same position within the camera field of view and evaluated in the recorded image by an image processing algorithm.
  • the position of the sensor relative to the document is clearly determined in three-dimensional space from the geometric information of the reference pattern projected onto the document surface and imaged in the sensor.
  • a suitable reference pattern is, for example, a small crosshair that is permanently projected onto the same position within the camera field of view. From the information of the crosshair size (distance) and the relative lengths of the Crosshair axes (tilt in x and y direction) the position of the sensor relative to the document is clearly determined in three-dimensional space.
  • the method for determining the position of a camera K relative to a document is implemented, for example, on a cell phone or mobile radio device which has the following features:
  • Camera K for example on the back of the mobile phone MT, for recording images from the surroundings
  • the mobile phone MT is moved a short distance above the document.
  • the characteristic features of the projection of a reference pattern F for determining the relative sensor position are roughly sketched using a constructed example:
  • Case a) compared to case b)
  • the camera is parallel to the document surface.
  • the distance from the camera to the document is greater in case a) than in case b).
  • the projected cross hair F in the camera image is smaller in case b) than in case a).
  • the crosshair size is directly related to the sensor distance and can be calculated from the individual camera image.
  • the camera K or the camera sensor is tilted relative to the document template.
  • the position of the sensor in 3-dimensional space relative to the document can be clearly determined from the absolute size of the crosshair in connection with the information about the relative lengths of the crosshair axes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Studio Devices (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Telephone Function (AREA)
  • Image Input (AREA)

Abstract

The invention relates to a method for scanning, in particular documents with the aid of a camera (K). The inventive method consists in combining an image sequence or a sequence of partial images in order to obtain a final image, projecting a reference model (F) onto the camera vision field and in compensating representational differences of different images on the basis of geometrical information of the model (F).

Description

Mobiltelefon mit einer Scan-HilfeMobile phone with a scan help
Die Erfindung betrifft ein Verfahren zum Scannen, insbesondere von Dokumenten, sowie ein Mobiltelefon gemäß dem Oberbegriff des Patentanspruchs 2.The invention relates to a method for scanning, in particular documents, and a mobile phone according to the preamble of claim 2.
Die Verwendung einer Kamera mit beispielsweise niedriger Auflösung zum Scannen von Dokumenten ist bekannt. Dabei wird die Kamera beziehungsweise das Mobiltelefon aus einem niedrigen Abstand über das Dokument bewegt. Aus den dabei aufgenommenen Bildern beziehungsweise Teilbildern wird ein Ergebnisbild generiert.The use of a camera with, for example, low resolution for scanning documents is known. The camera or mobile phone is moved over the document from a short distance. A result image is generated from the images or partial images recorded in the process.
Die Aufzeichnung der Bilder erfolgt beispielsweise mit einer hohen Abtastfrequenz von typischer Weise 15 oder 30 Hertz. Benachbarte Bilder besitzen aus diesem Grund einen sehr hohen Bildüberlapp. Durch Aneinanderreihung von schmalen Bildstreifen aus der jeweiligen Bildmitte und unter Berücksichtigung der Kameraverschiebung kann ein hochauflösendes Ergebnisbild kontinuierlich aufgebaut werden.The images are recorded, for example, with a high sampling frequency of typically 15 or 30 Hertz. For this reason, neighboring images have a very high image overlap. A high-resolution result image can be continuously built up by lining up narrow image strips from the respective image center and taking into account the camera shift.
Schon geringe Variationen des Abstandes zwischen Kamera und Dokument sowie eine leichte Verkippung der Kamera, wie sie bei einer in der Hand gehaltenen Kamera auftreten, führen jedoch zu sehr störenden Größenänderungen der abgebildeten Dokumenteninhalte. Die Größenänderungen müssen in einem ersten Verarbeitungsschritt untereinander ausgeglichen werden, damit das hochauflösende Ergebnisbild fehlerfrei aufgebaut werden kann. Die Bestimmung der Lage des Kamerasensors gegenüber dem Dokument insbesondere hinsichtlich Abstand und Verkippung ist die wesentliche und wichtige Voraussetzung zur Fehlerkompensation. Die Berechnung der relativen Lageinformation aus aufeinanderfolgenden Bildern ist ein bekannter Ansatz, der sehr komplex ist und meist sehr instabile Ergebnisse liefert. Verkippungen der Kamera gegenüber dem Dokument können im Allge- meinen nur sehr schwer auf der Basis der aufgezeichneten Bildinformation durch Bildverarbeitung erfasst werden.Even slight variations in the distance between the camera and the document, as well as a slight tilting of the camera, as occurs with a hand-held camera, lead to very disturbing changes in the size of the document content shown. The changes in size must be compensated for in a first processing step so that the high-resolution result image can be constructed without errors. The determination of the position of the camera sensor relative to the document, particularly with regard to distance and tilt, is the essential and important prerequisite for error compensation. The calculation of the relative position information from successive images is a well-known approach, which is very complex and usually gives very unstable results. Tilting of the camera relative to the document can generally mean that it is very difficult to capture on the basis of the recorded image information by image processing.
Der Erfindung liegt die Aufgabe zugrunde bei einem Verfahren zu Scannen und bei einem Mobiltelefon das Scannen von Dokumenten zu erleichtern.The invention has for its object in a method for scanning and to facilitate the scanning of documents in a mobile phone.
Diese Aufgabe wird erfindungsgemäß für ein Verfahren durch die im Patentanspruch 1 und für ein Mobiltelefon durch die im Patentanspruch 2 angegebenen Merkmale gelöst.This object is achieved for a method by the features specified in claim 1 and for a mobile phone by the features specified in claim 2.
Das erfindungsgemäße Verfahren beziehungsweise Mobiltelefon ermöglicht die schnelle und robuste Bestimmung der relativen Lage des Kamerasensors gegenüber dem Dokument.The method or mobile phone according to the invention enables the relative position of the camera sensor to the document to be determined quickly and robustly.
Erfindungsgemäß wird in das Gesichtsfeld der Kamera ein Referenzmuster eingeblendet. Die Auswertung der Geometrie des Musters in den Bildern ermöglicht die Kompensation der Abbildungsunterschiede in den Bildern.According to the invention, a reference pattern is faded into the field of view of the camera. The evaluation of the geometry of the pattern in the images enables the differences in imaging in the images to be compensated for.
Ein kleines Referenzmuster wird permanent an die gleiche Position innerhalb des Kameragesichtsfeldes projiziert und durch einen Bildverarbeitungsalgorithmus in dem aufgezeichneten Bild ausgewertet. Aus der geometrischen Information des auf die Dokumentenoberfläche projizierten und im Sensor abgebildeten Referenzmusters ist die Lage des Sensors relativ zum Dokument eindeutig im dreidimensionalen Raum bestimmt. Durch das Verwenden eines Referenzmusters ist die Extraktion der notwendigen geometrischen Information zur Kompensation der Abbildungsunterschiede in Bildern mit den Methoden der digitalen Bildverarbeitung sehr robust und schnell und erfolgt unabhängig von dem Inhalt des gescannten Dokumentes.A small reference pattern is permanently projected to the same position within the camera field of view and evaluated in the recorded image by an image processing algorithm. The position of the sensor relative to the document is clearly determined in three-dimensional space from the geometric information of the reference pattern projected onto the document surface and imaged in the sensor. By using a reference pattern, the extraction of the necessary geometric information to compensate for the image differences in images using the methods of digital image processing is very robust and fast and takes place regardless of the content of the scanned document.
Ein geeignetes Referenzmuster ist zum Beispiel ein kleines Fadenkreuz, das permanent an die gleiche Position innerhalb des Kameragesichtsfeldes projiziert wird. Aus der Information der Fadenkreuzgröße (Abstand) und der relativen Längen der Fadenkreuzachsen (Verkippung in x und y Richtung) ist die Lage des Sensors relativ zum Dokument eindeutig im dreidimensionalen Raum bestimmt.A suitable reference pattern is, for example, a small crosshair that is permanently projected onto the same position within the camera field of view. From the information of the crosshair size (distance) and the relative lengths of the Crosshair axes (tilt in x and y direction) the position of the sensor relative to the document is clearly determined in three-dimensional space.
Zusammenfassung der Vorteile des Verfahrens:Summary of the advantages of the procedure:
• Schnelligkeit und Robustheit in der Bestimmung der relativen Lage des Sensors zum Dokument• Speed and robustness in determining the relative position of the sensor to the document
• Sehr genaue Bestimmung des Abstands und der Verkippung des Sensors unabhängig von dem Inhalt des gescannten Dokuments.• Very precise determination of the distance and the tilt of the sensor regardless of the content of the scanned document.
Im folgenden wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispieles beschrieben.In the following the invention will be described with reference to an embodiment shown in the drawing.
Das Verfahren zur Lagebestimmung einer Kamera K relativ zu einem Dokument (nicht näher bezeichnet) wird, wie in der Figur 1 dargestellt, beispielsweise auf einem Handy oder Mobilfunkgerät realisiert, das die folgenden Merkmale besitzt:As shown in FIG. 1, the method for determining the position of a camera K relative to a document (not described in more detail) is implemented, for example, on a cell phone or mobile radio device which has the following features:
• Kamera K beispielsweise auf der Rückseite des Mobiltelefons MT zur Aufzeichnung von Bildern aus der Umgebung• Camera K, for example on the back of the mobile phone MT, for recording images from the surroundings
• Prozessor zur Verarbeitung der Bildinformation und zur Bestimmung der relativen Sensorlage• Processor for processing the image information and for determining the relative sensor position
• Leuchtdioden L auf der Rückseite des Handys MT zur Projektion eines Fadenkreuzes F in das Gesichtsfeld der Kamera K.• LEDs L on the back of the mobile phone MT for projecting a crosshair F into the field of view of the camera K.
Zum Einscannen, beispielsweise eines Dokumentes, wird das Mobiltelefon MT in einem geringen Abstand über das Dokument bewegt. Die charakteristischen Merkmale der Projektion eines Referenzmusters F zur Bestimmung der relativen Sensorlage werden an einem konstruierten Beispiel grob skizziert:To scan, for example, a document, the mobile phone MT is moved a short distance above the document. The characteristic features of the projection of a reference pattern F for determining the relative sensor position are roughly sketched using a constructed example:
Fall a) im Vergleich zu Fall b) Die Kamera ist in Fall a) und b) parallel zur Dokumentenoberfläche. Der Abstand der Kamera zum Dokument ist in Fall a) größer als in Fall b) . Das projizierte Fadenkreuz F im Kamerabild ist aus diesem Grund im Fall b) kleiner als in Fall a) . Die Fadenkreuzgröße steht in unmittelbarem Zusammenhang mit dem Sensorabstand und kann jeweils aus dem Kameraeinzelbild errechnet werden.Case a) compared to case b) In cases a) and b) the camera is parallel to the document surface. The distance from the camera to the document is greater in case a) than in case b). For this reason, the projected cross hair F in the camera image is smaller in case b) than in case a). The crosshair size is directly related to the sensor distance and can be calculated from the individual camera image.
Fall c)Case c)
Die Kamera K beziehungsweise der Kamerasensor ist gegenüber der Dokumentvorlage verkippt. Aus der absoluten Größe des Fadenkreuzes im Zusammenhang mit der Information über die relativen Längen der Fadenkreuzachsen kann die Lage des Sensors im 3 dimensionalen Raum gegenüber dem Dokument eindeutig bestimmt werden. The camera K or the camera sensor is tilted relative to the document template. The position of the sensor in 3-dimensional space relative to the document can be clearly determined from the absolute size of the crosshair in connection with the information about the relative lengths of the crosshair axes.

Claims

Patentansprüche claims
1. Verfahren zum Scannen, insbesondere von Dokumenten, mit einer Kamera (K) , wobei eine Folge von Bildern oder Teilbildern zu einem Ergebnisbild zusammengefügt wird, bei dem ein Referenzmuster (F) in das Kameragesichtsfeld projeziert wird, und bei dem auf Grundlage der geometrischen Information des Musters (F) in den einzelnen Bildern Abbildungsunterschiede in den Bildern kompensiert werden.1. A method for scanning, in particular documents, with a camera (K), a sequence of images or partial images being combined to form a result image, in which a reference pattern (F) is projected into the camera field of view, and based on the geometric Information of the pattern (F) in the individual images, image differences in the images can be compensated.
2. Mobiltelefon (MT) mit einer Kamera (K) und mit einer Bildverarbeitungseinrichtung zur Generierung eines Ergebnisbildes aus den bei einem Scanvorgang gewonnenen Bildern oder Teilbildern, g e k e n n z e i c h n e t d u r c h eine Projektionseinrichtung (L) , über die ein Referenzmuster (F) in das Kameragesichtsfeld projizierbar ist, und Mittel zur Kompensation von Abbildungsunterschieden in den einzelnen Bildern auf Grundlage der geometrischen Information des Musters (F) in den Bildern. 2. Mobile phone (MT) with a camera (K) and with an image processing device for generating a result image from the images or partial images obtained during a scanning process, characterized by a projection device (L) via which a reference pattern (F) can be projected into the camera field of view, and means for compensating image differences in the individual images based on the geometric information of the pattern (F) in the images.
PCT/EP2003/012096 2003-01-15 2003-10-30 Scan-assisted mobile telephone WO2004064383A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2004565937A JP2006514797A (en) 2003-01-15 2003-10-30 Mobile phone with scanning assistance
US10/542,480 US7773120B2 (en) 2003-01-15 2003-10-30 Scan-assisted mobile telephone
EP03815051A EP1584181A1 (en) 2003-01-15 2003-10-30 Scan-assisted mobile telephone

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP03000869.2 2003-01-15
EP03000869A EP1439689A1 (en) 2003-01-15 2003-01-15 Mobile telephone with scanning functionality

Publications (1)

Publication Number Publication Date
WO2004064383A1 true WO2004064383A1 (en) 2004-07-29

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US (1) US7773120B2 (en)
EP (2) EP1439689A1 (en)
JP (1) JP2006514797A (en)
CN (1) CN1739284A (en)
WO (1) WO2004064383A1 (en)

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Also Published As

Publication number Publication date
CN1739284A (en) 2006-02-22
EP1439689A1 (en) 2004-07-21
EP1584181A1 (en) 2005-10-12
JP2006514797A (en) 2006-05-11
US7773120B2 (en) 2010-08-10
US20060146359A1 (en) 2006-07-06

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